Merge pull request #2507 from matrix-org/bwindels/roomlistjslayout

Redesign: new layout algorithm for room sublists.

res/css/structures/_RoomSubList.scss

@@ -32,34 +32,13 @@ limitations under the License.
 */
 
 .mx_RoomSubList {
-    min-height: 31px;
-    flex: 0 10000 auto;
     display: flex;
     flex-direction: column;
 }
 
-.mx_RoomSubList.resized-sized {
-    /*
-    flex-basis to 0 so sublists
-    are not shrinking/growing relative
-    to their content (as would be the case with auto),
-    as this intervenes with sizing an item exactly
-    when not available space is available
-    in the flex container
-    */
-    flex: 1 1 0;
-}
 
-.mx_RoomSubList_nonEmpty {
-    min-height: 74px;
-
-    .mx_AutoHideScrollbar_offset {
+.mx_RoomSubList_nonEmpty .mx_AutoHideScrollbar_offset {
     padding-bottom: 4px;
-    }
-}
-
-.mx_RoomSubList_hidden {
-    flex: none !important;
 }
 
 .mx_RoomSubList_labelContainer {

res/css/views/rooms/_RoomList.scss

@@ -17,13 +17,14 @@ limitations under the License.
 
 .mx_RoomList {
     /* take up remaining space below TopLeftMenu */
-    flex: 1 1 auto;
-    /* use flexbox to layout sublists */
-    display: flex;
-    flex-direction: column;
+    flex: 1;
     min-height: 0;
 }
 
+.mx_RoomList .mx_ResizeHandle {
+    position: relative;
+}
+
 .mx_SearchBox {
     flex: none;
 }

src/components/structures/LeftPanel.js

@@ -212,6 +212,7 @@ const LeftPanel = React.createClass({
                     <CallPreview ConferenceHandler={VectorConferenceHandler} />
                     <RoomList
                         ref={this.collectRoomList}
+                        toolbarShown={this.props.toolbarShown}
                         collapsed={this.props.collapsed}
                         searchFilter={this.state.searchFilter}
                         ConferenceHandler={VectorConferenceHandler} />

src/components/structures/LoggedInView.js

@@ -545,6 +545,7 @@ const LoggedInView = React.createClass({
                 <DragDropContext onDragEnd={this._onDragEnd}>
                     <div ref={this._setResizeContainerRef} className={bodyClasses}>
                         <LeftPanel
+                            toolbarShown={!!topBar}
                             collapsed={this.props.collapseLhs || this.state.collapseLhs || false}
                             disabled={this.props.leftDisabled}
                         />

src/components/structures/RoomSubList.js

@@ -313,6 +313,12 @@ const RoomSubList = React.createClass({
         }
     },
 
+    setHeight: function(height) {
+        if (this.refs.subList) {
+            this.refs.subList.style.height = `${height}px`;
+        }
+    },
+
     render: function() {
         const len = this.props.list.length + this.props.extraTiles.length;
         if (len) {
@@ -322,13 +328,13 @@ const RoomSubList = React.createClass({
                 "mx_RoomSubList_nonEmpty": len && !this.state.hidden,
             });
             if (this.state.hidden) {
-                return <div className={subListClasses}>
+                return <div ref="subList" className={subListClasses}>
                     {this._getHeaderJsx()}
                 </div>;
             } else {
                 const tiles = this.makeRoomTiles();
                 tiles.push(...this.props.extraTiles);
-                return <div className={subListClasses}>
+                return <div ref="subList" className={subListClasses}>
                     {this._getHeaderJsx()}
                     <IndicatorScrollbar ref="scroller" className="mx_RoomSubList_scroll">
                         { tiles }
@@ -343,7 +349,7 @@ const RoomSubList = React.createClass({
             }
 
             return (
-                <div className="mx_RoomSubList">
+                <div ref="subList" className="mx_RoomSubList">
                     { this._getHeaderJsx() }
                     { content }
                 </div>

src/components/views/rooms/RoomList.js

@@ -36,7 +36,8 @@ import GroupStore from '../../../stores/GroupStore';
 import RoomSubList from '../../structures/RoomSubList';
 import ResizeHandle from '../elements/ResizeHandle';
 
-import {Resizer, RoomSubListDistributor} from '../../../resizer'
+import {Resizer} from '../../../resizer'
+import {Layout, Distributor} from '../../../resizer/distributors/roomsublist2';
 const HIDE_CONFERENCE_CHANS = true;
 const STANDARD_TAGS_REGEX = /^(m\.(favourite|lowpriority|server_notice)|im\.vector\.fake\.(invite|recent|direct|archived))$/;
 
@@ -79,6 +80,23 @@ module.exports = React.createClass({
         const collapsedJson = window.localStorage.getItem("mx_roomlist_collapsed");
         this.subListSizes = sizesJson ? JSON.parse(sizesJson) : {};
         this.collapsedState = collapsedJson ? JSON.parse(collapsedJson) : {};
+        this._layoutSections = [];
+
+        this._layout = new Layout((key, size) => {
+            const subList = this._subListRefs[key];
+            if (subList) {
+                subList.setHeight(size);
+            }
+            // update overflow indicators
+            this._checkSubListsOverflow();
+            // don't store height for collapsed sublists
+            if(!this.collapsedState[key]) {
+                this.subListSizes[key] = size;
+                window.localStorage.setItem("mx_roomlist_sizes",
+                    JSON.stringify(this.subListSizes));
+            }
+        }, this.subListSizes, this.collapsedState);
+
         return {
             isLoadingLeftRooms: false,
             totalRoomCount: null,
@@ -146,54 +164,38 @@ module.exports = React.createClass({
         this._delayedRefreshRoomListLoopCount = 0;
     },
 
-    _onSubListResize: function(newSize, id) {
-        if (!id) {
-            return;
-        }
-        if (typeof newSize === "string") {
-            newSize = Number.MAX_SAFE_INTEGER;
-        }
-        if (newSize === null) {
-            delete this.subListSizes[id];
-        } else {
-            this.subListSizes[id] = newSize;
-        }
-        window.localStorage.setItem("mx_roomlist_sizes", JSON.stringify(this.subListSizes));
-        // update overflow indicators
-        this._checkSubListsOverflow();
-    },
-
     componentDidMount: function() {
         this.dispatcherRef = dis.register(this.onAction);
         const cfg = {
-            onResized: this._onSubListResize,
+            layout: this._layout,
         };
-        this.resizer = new Resizer(this.resizeContainer, RoomSubListDistributor, cfg);
+        this.resizer = new Resizer(this.resizeContainer, Distributor, cfg);
         this.resizer.setClassNames({
             handle: "mx_ResizeHandle",
             vertical: "mx_ResizeHandle_vertical",
             reverse: "mx_ResizeHandle_reverse"
         });
-
-        // load stored sizes
-        Object.keys(this.subListSizes).forEach((key) => {
-            this._restoreSubListSize(key);
-        });
+        this._layout.update(
+            this._layoutSections,
+            this.resizeContainer && this.resizeContainer.offsetHeight,
+        );
         this._checkSubListsOverflow();
 
         this.resizer.attach();
+        window.addEventListener("resize", this.onWindowResize);
         this.mounted = true;
     },
 
     componentDidUpdate: function(prevProps) {
         this._repositionIncomingCallBox(undefined, false);
-        if (this.props.searchFilter !== prevProps.searchFilter) {
-            // restore sizes
-            Object.keys(this.subListSizes).forEach((key) => {
-                this._restoreSubListSize(key);
-            });
-            this._checkSubListsOverflow();
-        }
+        // if (this.props.searchFilter !== prevProps.searchFilter) {
+        //     this._checkSubListsOverflow();
+        // }
+        this._layout.update(
+            this._layoutSections,
+            this.resizeContainer && this.resizeContainer.clientHeight,
+        );
+        // TODO: call layout.setAvailableHeight, window height was changed when bannerShown prop was changed
     },
 
     onAction: function(payload) {
@@ -222,6 +224,7 @@ module.exports = React.createClass({
     componentWillUnmount: function() {
         this.mounted = false;
 
+        window.removeEventListener("resize", this.onWindowResize);
         dis.unregister(this.dispatcherRef);
         if (MatrixClientPeg.get()) {
             MatrixClientPeg.get().removeListener("Room", this.onRoom);
@@ -251,6 +254,17 @@ module.exports = React.createClass({
         this._delayedRefreshRoomList.cancelPendingCall();
     },
 
+    onWindowResize: function() {
+        if (this.mounted && this._layout && this.resizeContainer &&
+            Array.isArray(this._layoutSections)
+        ) {
+            this._layout.update(
+                this._layoutSections,
+                this.resizeContainer.offsetHeight
+            );
+        }
+    },
+
     onRoom: function(room) {
         this.updateVisibleRooms();
     },
@@ -551,22 +565,16 @@ module.exports = React.createClass({
         this.collapsedState[key] = collapsed;
         window.localStorage.setItem("mx_roomlist_collapsed", JSON.stringify(this.collapsedState));
         // load the persisted size configuration of the expanded sub list
-        if (!collapsed) {
-            this._restoreSubListSize(key);
+        if (collapsed) {
+            this._layout.collapseSection(key);
+        } else {
+            this._layout.expandSection(key, this.subListSizes[key]);
         }
         // check overflow, as sub lists sizes have changed
         // important this happens after calling resize above
         this._checkSubListsOverflow();
     },
 
-    _restoreSubListSize(key) {
-        const size = this.subListSizes[key];
-        const handle = this.resizer.forHandleWithId(key);
-        if (handle) {
-            handle.resize(size);
-        }
-    },
-
     // check overflow for scroll indicator gradient
     _checkSubListsOverflow() {
         Object.values(this._subListRefs).forEach(l => l.checkOverflow());
@@ -581,6 +589,7 @@ module.exports = React.createClass({
     },
 
     _mapSubListProps: function(subListsProps) {
+        this._layoutSections = [];
         const defaultProps = {
             collapsed: this.props.collapsed,
             isFiltered: !!this.props.searchFilter,
@@ -599,6 +608,7 @@ module.exports = React.createClass({
         return subListsProps.reduce((components, props, i) => {
             props = Object.assign({}, defaultProps, props);
             const isLast = i === subListsProps.length - 1;
+            const len = props.list.length + (props.extraTiles ? props.extraTiles.length : 0);
             const {key, label, onHeaderClick, ... otherProps} = props;
             const chosenKey = key || label;
             const onSubListHeaderClick = (collapsed) => {
@@ -608,7 +618,10 @@ module.exports = React.createClass({
                 }
             };
             const startAsHidden = props.startAsHidden || this.collapsedState[chosenKey];
-
+            this._layoutSections.push({
+                id: chosenKey,
+                count: len,
+            });
             let subList = (<RoomSubList
                 ref={this._subListRef.bind(this, chosenKey)}
                 startAsHidden={startAsHidden}

src/resizer/distributors/roomsublist2.js

@@ -0,0 +1,305 @@
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import FixedDistributor from "./fixed";
+
+// const allowWhitespace = true;
+const handleHeight = 1;
+
+function log() {
+}
+
+function clamp(height, min, max) {
+    //log(`clamping ${height} between ${min} and ${max}`);
+    if (height > max) return max;
+    if (height < min) return min;
+    return height;
+}
+
+export class Layout {
+    constructor(applyHeight, initialSizes, collapsedState) {
+        this._applyHeight = applyHeight;
+        this._sections = [];
+        this._collapsedState = Object.assign({}, collapsedState);
+        this._availableHeight = 0;
+        // heights stored by section section id
+        this._sectionHeights = Object.assign({}, initialSizes);
+        // in-progress heights, while dragging. Committed on mouse-up.
+        this._heights = [];
+    }
+
+    setAvailableHeight(newSize) {
+        this._availableHeight = newSize;
+        // needs more work
+        this._applyNewSize();
+    }
+
+    expandSection(id, height) {
+        this._collapsedState[id] = false;
+        this._applyNewSize();
+        this.openHandle(id).setHeight(height).finish();
+    }
+
+    collapseSection(id) {
+        this._collapsedState[id] = true;
+        this._applyNewSize();
+    }
+
+    // [{id, count}]
+    update(sections, availableHeight) {
+        if (Number.isFinite(availableHeight)) {
+            this._availableHeight = availableHeight;
+        }
+        const totalHeight = this._getAvailableHeight();
+        this._sections.forEach((section, i) => {
+            if (!this._sectionHeights.hasOwnProperty(section.id)) {
+                this._sectionHeights[section.id] = clamp(
+                    totalHeight / this._sections.length,
+                    this._getMinHeight(i),
+                    this._getMaxHeight(i),
+                );
+            }
+        });
+        this._sections = sections;
+        this._applyNewSize();
+    }
+
+    openHandle(id) {
+        const index = this._getSectionIndex(id);
+        //log(`openHandle resolved ${id} to ${index}`);
+        return new Handle(this, index, this._sectionHeights[id]);
+    }
+
+    _getAvailableHeight() {
+        const nonCollapsedSectionCount = this._sections.reduce((count, section) => {
+            const collapsed = this._collapsedState[section.id];
+            return count + (collapsed ? 0 : 1);
+        }, 0);
+        return this._availableHeight - ((nonCollapsedSectionCount - 1) * handleHeight);
+    }
+
+    _applyNewSize() {
+        const newHeight = this._getAvailableHeight();
+        const currHeight = this._sections.reduce((sum, section) => {
+            return sum + this._sectionHeights[section.id];
+        }, 0);
+        const offset = newHeight - currHeight;
+        this._heights = this._sections.map((section) => this._sectionHeights[section.id]);
+        const sections = this._sections.map((_, i) => i);
+        this._applyOverflow(-offset, sections, true);
+        this._applyHeights();
+        this._commitHeights();
+    }
+
+    _getSectionIndex(id) {
+        return this._sections.findIndex((s) => s.id === id);
+    }
+
+    _getMaxHeight(i) {
+        const section = this._sections[i];
+        const collapsed = this._collapsedState[section.id];
+
+        if (collapsed) {
+            return this._sectionHeight(0);
+        } else {
+            return 100000;
+            // return this._sectionHeight(section.count);
+        }
+    }
+
+    _sectionHeight(count) {
+        return 36 + (count === 0 ? 0 : 4 + (count * 34));
+    }
+
+    _getMinHeight(i) {
+        const section = this._sections[i];
+        const collapsed = this._collapsedState[section.id];
+        const maxItems = collapsed ? 0 : 1;
+        // log("_getMinHeight", i, section);
+        return this._sectionHeight(Math.min(section.count, maxItems));
+    }
+
+    _applyOverflow(overflow, sections, blend) {
+        //log("applyOverflow", overflow, sections);
+        // take the given overflow amount, and applies it to the given sections.
+        // calls itself recursively until it has distributed all the overflow
+        // or run out of unclamped sections.
+
+        const unclampedSections = [];
+
+        let overflowPerSection = blend ? (overflow / sections.length) : overflow;
+        for (const i of sections) {
+            const newHeight = clamp(
+                this._heights[i] - overflowPerSection,
+                this._getMinHeight(i),
+                this._getMaxHeight(i),
+            );
+            if (newHeight == this._heights[i] - overflowPerSection) {
+                unclampedSections.push(i);
+            }
+            // when section is growing, overflow increases?
+            // 100 -= 200 - 300
+            // 100 -= -100
+            // 200
+            overflow -= this._heights[i] - newHeight;
+            // console.log(`this._heights[${i}] (${this._heights[i]}) - newHeight (${newHeight}) = ${this._heights[i] - newHeight}`);
+            // console.log(`changing ${this._heights[i]} to ${newHeight}`);
+            this._heights[i] = newHeight;
+            // console.log(`for section ${i} overflow is ${overflow}`);
+            if (!blend) {
+                overflowPerSection = overflow;
+                if (Math.abs(overflow) < 1.0) break;
+            }
+        }
+
+        if (Math.abs(overflow) > 1.0 && unclampedSections.length > 0) {
+            // we weren't able to distribute all the overflow so recurse and try again
+            // log("recursing with", overflow, unclampedSections);
+            overflow = this._applyOverflow(overflow, unclampedSections, blend);
+        }
+
+        return overflow;
+    }
+
+    _rebalanceAbove(anchor, overflowAbove) {
+        if (Math.abs(overflowAbove) > 1.0) {
+            // log(`trying to rebalance upstream with ${overflowAbove}`);
+            const sections = [];
+            for (let i = anchor - 1; i >= 0; i--) {
+                sections.push(i);
+            }
+            overflowAbove = this._applyOverflow(overflowAbove, sections);
+        }
+        return overflowAbove;
+    }
+
+    _rebalanceBelow(anchor, overflowBelow) {
+        if (Math.abs(overflowBelow) > 1.0) {
+            // log(`trying to rebalance downstream with ${overflowBelow}`);
+            const sections = [];
+            for (let i = anchor + 1; i < this._sections.length; i++) {
+                sections.push(i);
+            }
+            overflowBelow = this._applyOverflow(overflowBelow, sections);
+            //log(`rebalanced downstream with ${overflowBelow}`);
+        }
+        return overflowBelow;
+    }
+
+    // @param offset the amount the anchor is moved from what is stored in _sectionHeights, positive if downwards
+    // if we're clamped, return the offset we should be clamped at.
+    _relayout(anchor = 0, offset = 0, clamped = false) {
+        this._heights = this._sections.map((section) => this._sectionHeights[section.id]);
+        // are these the amounts the items above/below shrank/grew and need to be relayouted?
+        let overflowAbove;
+        let overflowBelow;
+        const maxHeight = this._getMaxHeight(anchor);
+        const minHeight = this._getMinHeight(anchor);
+        // new height > max ?
+        if (this._heights[anchor] + offset > maxHeight) {
+            // we're pulling downwards and clamped
+            // overflowAbove = minus how much are we above max height?
+            overflowAbove = (maxHeight - this._heights[anchor]) - offset;
+            overflowBelow = offset;
+            // log(`pulling downwards clamped at max: ${overflowAbove} ${overflowBelow}`);
+        } else if (this._heights[anchor] + offset < minHeight) { // new height < min?
+            // we're pulling upwards and clamped
+            // overflowAbove = ??? (offset is negative here, so - offset will add)
+            overflowAbove = (minHeight - this._heights[anchor]) - offset;
+            overflowBelow = offset;
+            // log(`pulling upwards clamped at min: ${overflowAbove} ${overflowBelow}`);
+        } else {
+            overflowAbove = 0;
+            overflowBelow = offset;
+            // log(`resizing the anchor: ${overflowAbove} ${overflowBelow}`);
+        }
+        this._heights[anchor] = clamp(this._heights[anchor] + offset, minHeight, maxHeight);
+
+        // these are reassigned the amount of overflow that could not be rebalanced
+        // meaning we dragged the handle too far and it can't follow the cursor anymore
+        overflowAbove = this._rebalanceAbove(anchor, overflowAbove);
+        overflowBelow = this._rebalanceBelow(anchor, overflowBelow);
+
+        if (!clamped) { // to avoid risk of infinite recursion
+            // clamp to avoid overflowing or underflowing the page
+            if (Math.abs(overflowAbove) > 1.0) {
+                // log(`clamping with overflowAbove ${overflowAbove}`);
+                // here we do the layout again with offset - the amount of space we took too much
+                this._relayout(anchor, offset + overflowAbove, true);
+                return offset + overflowAbove;
+            }
+
+            if (Math.abs(overflowBelow) > 1.0) {
+                // here we do the layout again with offset - the amount of space we took too much
+                // log(`clamping with overflowBelow ${overflowBelow}`);
+                this._relayout(anchor, offset - overflowBelow, true);
+                return offset - overflowBelow;
+            }
+        }
+
+        this._applyHeights();
+        return undefined;
+    }
+
+    _applyHeights() {
+        log("updating layout, heights are now", this._heights);
+        // apply the heights
+        for (let i = 0; i < this._sections.length; i++) {
+            const section = this._sections[i];
+            this._applyHeight(section.id, this._heights[i]);
+        }
+    }
+
+    _commitHeights() {
+        this._sections.forEach((section, i) => {
+            this._sectionHeights[section.id] = this._heights[i];
+        });
+    }
+}
+
+class Handle {
+    constructor(layout, anchor, height) {
+        this._layout = layout;
+        this._anchor = anchor;
+        this._initialHeight = height;
+    }
+
+    setHeight(height) {
+        this._layout._relayout(this._anchor, height - this._initialHeight);
+        return this;
+    }
+
+    finish() {
+        this._layout._commitHeights();
+        return this;
+    }
+}
+
+export class Distributor extends FixedDistributor {
+    constructor(item, cfg) {
+        super(item);
+        const layout = cfg.layout;
+        this._handle = layout.openHandle(item.id);
+    }
+
+    finish() {
+        this._handle.finish();
+    }
+
+    resize(height) {
+        this._handle.setHeight(height);
+    }
+}